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From: Fabian Frederick <fabf@skynet.be>
To: jack@suse.cz, amir73il@gmail.com
Cc: linux-fsdevel@vger.kernel.org, Fabian Frederick <fabf@skynet.be>
Subject: [PATCH 7/9 linux-next] fanotify: don't write with zero size
Date: Mon, 11 May 2020 20:02:27 +0200	[thread overview]
Message-ID: <20200511180227.215152-1-fabf@skynet.be> (raw)

check count in fanotify_write() and return -EINVAL when 0

Signed-off-by: Fabian Frederick <fabf@skynet.be>
---
 fs/notify/fanotify/fanotify_user.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 02a314acc757..6e19dacb2475 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -485,6 +485,9 @@ static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t
 	if (!IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS))
 		return -EINVAL;
 
+	if (!count)
+		return -EINVAL;
+
 	group = file->private_data;
 
 	if (count > sizeof(response))
-- 
2.26.2


             reply	other threads:[~2020-05-11 18:02 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-11 18:02 Fabian Frederick [this message]
2020-05-11 21:49 ` [PATCH 7/9 linux-next] fanotify: don't write with zero size Amir Goldstein

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